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Classic, Vintage & Veteran For Coventry and Meriden Models. Anything pre-Hinckley goes.

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Old 04-18-2007, 06:32 PM   #1 (permalink)
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Hi All,

I know this has been discussed but if you don't mind indulging me...My bike is having an issue with the charging system....It's not charging. I have had some work done and some of the electrical components were relocated. I have a Tympanium rectifier. I noticed the red wire is to the positive on the battery and the brown wire is grounded. With positive earth dose that meen they are both grounded and my alternator is not juicing the battery at all? But all my other components are hooked to the positive terminal of the battery as well, including the Boyer ignition, and the bike runs with a charged battery and the lights work etc. Do I need to ground the positive terminal of the battery and run everything else to the negative. How does positive earth work with some after market electronics? Do I just wire everything backwards? Also jump starting the bike...is it positive to positive, or positve to negative?

Thanks in advance.
-Ty
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Old 04-18-2007, 10:23 PM   #2 (permalink)
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Jump starting is always Postive to positive.

The only reason to re-wire a Positive ground bike is to run modern LEDs.

I suggest restoring the wiring to original.
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Old 04-19-2007, 12:22 PM   #3 (permalink)
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Thanks for the reply GrandpaulZ.

I don't want to rewire it to negative earth. I just want it wired correctly to possitive earth. I think some of the components have been wired wrong. I guess what I want to know is, on a positive ground bike, does the red wire from the rectifier get grounded and the brown wire to the negative terminal on the battery? And the hot leads for the ignition and lights, do they go to the negative side of the battery?

Weird........
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Old 04-19-2007, 02:06 PM   #4 (permalink)
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IF the wire to the battery Positive is Red, then the wire to the rectifier ground should be Red, and all other ground wires are Red.

If the above is true, then the Brown w/ White striped wire should go to the rectifier center terminal, and the Brown w/ Blue striped wire and in-line fuse should go to the battery Negative terminal.

All of the above is a typical Positive ground system.

Do you have a shop manual w/ wiring diagram?
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Old 04-19-2007, 04:57 PM   #5 (permalink)
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Yeah, I do have a shop manual. And in reviewing it, it looks to me like the bike is wired as if it is negative ground. But it's not...It' spositive ground. Everything on the bike works except the alternator. So, when I switch everything to positive ground I assume the alternator will work but now I get no spark. Therefore, I think the Boyer is hooked up as if it is negative ground. What a mess...That's what happens when someone works on a bike that they don't know is positive ground. I'll check the Boyer later.

I appreciate your help GrandPaulZ......

Cheers

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Old 04-19-2007, 05:03 PM   #6 (permalink)
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yea!!!!!!!!!!!I'm not a newbie anymore.
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Old 04-19-2007, 06:24 PM   #7 (permalink)
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Most Boyer black boxes have the wiring diagram right on the label.
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Old 04-20-2007, 01:02 PM   #8 (permalink)
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LED lights can not be wired for a positive ground system?
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Old 04-20-2007, 01:06 PM   #9 (permalink)
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I've never tried wiring LEDs to a bike, either positive OR negative ground.

I've HEARD they don't work because LEDs are polarity sensitive. I'd think you could just wire them for the proper polarity by wiring the "ground" on the LED module to the "power" lead from the bike, and the power lead from the LED to the fender/ground.

...but then, what do I know?
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Old 04-20-2007, 01:40 PM   #10 (permalink)
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79 and later Triumphs were wired negative ground, positive hot. Your bike is now wired the same way.
The person who did the relocation may not have been aware of the bike's original positive ground arrangement. I am assuming that they didn't also rewire the Boyer to match?
If the brown wire goes to the negative pole of the battery and the negative pole is then also grounded, as the mechanic would not have had to relocate the battery, the leads to the battery may be original, then the system won't charge.
So, just make sure the red wire is grounded and that all the ground wires link together, not using the frame for the ground (called "bonding"), that the brown wire goes to the negative pole of the battery, and that the negative pole of the battery then attaches to the ignition switch "hot" position.
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